In the early 1980’s, the company has taken the lead in researching and developing composite insulators in China, and introduced her series products of TONLY™ composite insulators to utilities. All its products for various voltage applications were firstly passing tests and accredited with national level in China, and its 500kV AC and DC, 800kV DC and 1000kV AC composite insulators were firstly served in the power grid of China.